Double-action pump



Oct. 1, 1929; D. H. MOSTELLER DOUBLE ACTION PUMP Filed Jan. 21, 1928 INVENTOR D..HM)steZler ATTORNEY Patented st. 1, 1929 DOUBLE-ACTIClN PUMP Application filed January 21, 1928.

This invention relates to improvements in pumps and particularly to air pumps of a portable hand operated type.

The principal object of my invention is to r provide a pump of this general character so constructed that a large volume of air may be compressed to a considerable pressure with a relatively small physical effort being necessary and in a very short time. The pump is therefore suitable for use in private garages to pump up tires, and also on farms, etc., to supply the necessary air pressure for small pressure spray and other outfits of various kinds requiring the use of compressed air in their operation.

A further object of the invention is to construct a pump of an extremely simple and sturdy nature, so that there is nothing to readily get out of order and so that it can be given the usual careless or rough handling without danger of damage or breakage. At the same time the weight of the structure is such that it can be readily carried from place to place by any one of ordinary strength.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of ref- 3@ erence indicate corresponding parts in the several views:

Fig. 1 is a side elevation of my improved pump partly broken out.

Fig. 2 is an end elevation of the same.

Fig. 3 is a fragmentary cross section showing a bearing structure for one of the operating gear spindles.

Referring now more particularly to the characters of reference on the drawings, the 4f) numeral 1 denotes a fiat base plate, which is preferably of heavy sheet metal of rectangular shape so as to be practically proof against breakage. and hollowed out in the middle so as to reduce its weight while enabling the same to cover a relatlvely large ground area.

Superimposed on and extending across the plate from end to end thereof'is a cross plate 2 rigidly secured to the plate 1 by welding or other suitable means.

Secured in the base at the opposite ends Serial No. 248,321.

thereof are upstanding and long studs 3, which project through the horizontal end flanges 4 of a cross frame 5. Between the flanges and plate 2 tubular spacers6 are placed about the studs, so thatsaid flanges are supported bythe spacers; nuts? on the upper ends of the studs serving to clamp the flanges, spacers and bottom plate in rigid relation to each other. The members 4: and 5 are preferably formed of a heavy angle iron, the hori- Zontal element of which is out between the flanges and is bent upwardly to lie parallel to the lower vertical portion of the angle as at 5 in Fig. 2. i

members 5 and 5 form the support for the bearing sleeves 8 of a pair of spindles 9 on one end of which are fixed a pair of gears 10 which are constantly in mesh with each other and are of the same size. An operating crank-11 of suitable length is applied to one of the spindles on the end thereof opposite to the gear. The upper portions of the gears are covered by a guard housing 12, while a handle structure 18 extends over the guard in spaced relation thereto. The handle and the uard rest on and are supported by the flanges 4 and are clamped in place by the nuts 7. This handle member 13 enables the entire structure to be readily lifted up when it is desired to carry the pump from one place to another and the guard over the gears under the handle prevents the hand from possibly coming in contact with the gears.

Adjacent the rims 0f the gears, crank pins 14 project outwardly therefrom, the heads 15 of combination connecting and piston rods 16 being connected to said pins. These rods are rigid from end to end and are slidable through the heads of separate cylinders 17 which at their lower ends are pivoted on to brackets 18 secured to the plate 2. The lower ends of the rods carry "pistons or plungers 19 of suitable character which are slidable. in the cylinders.

The bottoms of the cylinders have oppose intake and outlet openings, connected to which are intake and outlet check valves 20 and 21, opening to and from the cylinders respectively. The valves 20 are freely open to the atmosphere while the outer ends of the valves 21 are interconnected by means of flexible tubes 22 Which lead from said valves to the opposite ends of a T fitting 23 to which a single link of flexible tubing 24 of any desired length is connected.

In operation it will be seen that With the turning of the crank 11 the pistons 19 will be reciprocated in'the cylinders, alternately taking in air through the intake valves and forcing such air through the outlet valves and thence into the common tube 24, which of course leads to and is connected with the tire tank or other member supplied with air. With such reciprocation the cylinders of course oscillate on their bracket pinsa feature of construction which enables rigid connecting and piston rods, and a consequent simplicity of construction in this respect, to be employed. The flexible tubular connec tions between the outlet valves and the tube 24 enables this oscillation to take place With out the use of any sWivelor other oints Which are expensive and are liable to leak.

The crank 11 is considerably longer than the distance of the crank pins from the gear spindles, so that a greatly increased leverage and an accompanying ease of operation is obtained.

The crank pins are preferably set 90 apart relative to each other, so as to cause the strokes of the pistons to take place in oi'l'set relation to each other thus making for. more even operation and distribution of the strains on the handle and operator.

From the foregoing description it Will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

l/Vhile this specification sets forth in detail the presentand preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention What I claim as neW and useful and desire to secure by Letters Patents is: 1. A portable pump comprising a portable base plate, a horizontal frame member thereabove, connecting and supporting means between the base plate and the frame, meshed gears mounted in the frame, cylinders mounted on the base plate, pistons in the cylinders, connecting means between the pi tons and gears to cause said pistons to be reciprocated With the turning of the gears, an operating crank applied to one gear for turning the same, and a handle member for carrying the structure extending horizontally above the frame and gears in spaced relation thereto and connected at its ends to said frame.

2. A portable pump comprising a base plate, a horizontal frame member thereabove DOSIER H. MOSTELLER. 

